21092012064 has 96 divisors (see below), whose sum is σ = 65137141440. Its totient is φ = 6617097216.

The previous prime is 21092012063. The next prime is 21092012077. The reversal of 21092012064 is 46021029012.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21092012063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 703314 + ... + 732689.

It is an arithmetic number, because the mean of its divisors is an integer number (678511890).

Almost surely, 2^21092012064 is an apocalyptic number.

21092012064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21092012064 is an abundant number, since it is smaller than the sum of its proper divisors (44045129376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21092012064 is a wasteful number, since it uses less digits than its factorization.

21092012064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436039 (or 1436025 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 21092012064 in words is "twenty-one billion, ninety-two million, twelve thousand, sixty-four".